{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How does blockchain prevent double-spending attacks?","a":"Proof-of-Work (PoW): In a PoW blockchain, attackers need to consume a large amount of computing resources to generate valid blocks. This makes it difficult for attackers to generate two main chains of the same length in a short period of time, thereby reducing the success rate of double-spending attacks."}]}],"pr":"e82f85850767966b2b5e5e355b252869b991631cb3b9157578b4d4977a65ac4f"}